Views: 0 Author: Site Editor Publish Time: 2022-07-20 Origin: Site
The following classifications are made according to the characteristics of tube axial fans:
Classification by material: steel fan, FRP fan, plastic fan, PP fan, PVC fan, magnesium alloy fan, aluminum fan, stainless steel fan, etc.
Classification by use: explosion-proof fan, anti-corrosion fan, explosion-proof anti-corrosion fan, special tube axial fan, fan and other types.
Classification according to use requirements: pipeline type, wall type, post type, fixed type, rain proof and dust-proof type, mobile type, motor external type, etc.
According to the installation method, it can be divided into belt drive type and motor direct connection type.
When the axial fan is started, the current of the motor will be 5-6 times higher than the rated value, which will not only affect the service life of the motor, but also consume more power During the design of the system, a certain margin will be left in the motor selection, and the speed of the motor is fixed, but in the actual use process, sometimes it is necessary to run at a lower or higher speed, so it is very necessary to carry out frequency conversion transformation. The frequency converter can realize the soft start of the motor, achieve the purpose of energy-saving speed regulation by changing the input voltage frequency of the equipment, and provide the equipment with overcurrent, overvoltage, overload and other protection functions.
Application of tube axial fan
It can be used for ventilation or heat dissipation in places such as metallurgy, chemical industry, light industry, food, medical equipment, mechanical equipment and civil buildings If the casing is removed, it can also be used as a free fan, or it can be installed in series at intervals in a long exhaust pipe to improve the wind pressure in the pipe.
Small axial fan: low power consumption, fast heat dissipation, low noise, energy conservation and environmental protection. Because of its small size, it is widely used.
Large tube axial fan has the characteristics of simple structure, stability and reliability, low noise, large air volume, wide range of function selection and so on.
The main differences between centrifugal fans and axial fans are:
1. The centrifugal fan changes the flow direction of the medium in the air duct, while the axial fan does not change the flow direction of the medium in the air duct;
2. The installation of the former is complex;
3. The motor of the former is generally connected with the fan through the belt to drive the rotating wheel, while the motor of the latter is generally in the fan;
4. The former is often installed at the inlet and outlet of air conditioning units, boiler drums, induced draft fans, etc. The latter is often installed in the middle of the air duct or at the front end of the air duct outlet.
In addition, there are diagonal flow (mixed flow) fans, whose wind pressure coefficient is higher than that of tube axial fans, and the flow coefficient is larger than that of centrifugal fans. It fills the gap between tube axial fan and centrifugal fan. At the same time, it has the characteristics of simple and convenient installation. Mixed flow (or axial impingement) fans combine the characteristics of axial flow and centrifugal fans, although it looks more like traditional tube axial fans. Weld the curved plate-shaped blade on the conical steel hub. Change the flow by changing the blade angle in the inlet housing upstream of the impeller. The casing can have an open inlet, but more commonly, it has a right angle bending shape so that the motor can be placed outside the pipe. The discharge shell expands slowly to slow down the flow of air or gas and convert kinetic energy into useful static pressure.